I think something suffered on the PS3 version because it's really choppy. I wish I bought it on PC or 360, but I had to have the movie so I waited for the PS3 SE.
There's still some choppiness in the PC version. I think it's just due to the engine.
Heh, I finally get to disagree with you on that.

Even on my 8800GT I never ran into a single instance of slowdown. Was 100% smooth 100% of the time (and I never miss framerate drops). Of course, anti-aliasing wasn't supported AT ALL, so the game was jaggy as hell.
I have played the console versions (just a bit), however, and I can confirm that both are 30 fps titles. The PS3 version was actually limited to 30 fps while the 360 version would occasionally spike to 60 (only when standing in empty hallways). From what I experienced, both versions were generally a stable 30 fps with slowdown at points. The PC version was much smoother and easier to play thanks to the mouse. I thought it was pretty damn boring overall, though. I'm not even sure why I kept playing. I just assumed it MIGHT get more interesting, but no, it never really did. Before I knew it, the game was over. :\